title: Photothermal trapping of dielectric particles by optical fiber-ring.
abstract: The removal of dielectric particles and bacteria from water is an extremely important global issue, particularly, for drinking and sanitation. This work provides a demonstration of optical purification of water using an optical fiber-ring. The size of particles suspended in water for trapping is 2.08 μm in diameter and the wavelength of light used for inducing photothermal effect is 1.55 μm with a power of 97 mW. The fiber, 6 μm in diameter, was formed to a racket-shaped ring with a minimum diameter of 167 μm and a maximum one of 350 μm. Experiment indicates that the particles moved toward the ring with the highest velocity of 4.2 μm/s and are trapped/assembled in the center of the ring once the laser beam of 1.55-μm wavelength was launched into the fiber. With a moving of the fiber-ring, the trapped/assembled particles were moved and the water can be purified by removal of the particles.
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
authors.forename: Hongbao
authors.initials: H
authors.lastname: Xin
authors.forename: Hongxiang
authors.initials: H
authors.lastname: Lei
authors.forename: Yao
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xingmin
authors.initials: X
authors.lastname: Li
authors.forename: Baojun
authors.initials: B
authors.lastname: Li
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D004926:Escherichia coli / Q000302:isolation & purification*; D005336:Fiber Optic Technology / Q000295:instrumentation*; D006358:Hot Temperature; D008027:Light; D052898:Optical Tweezers; D014871:Water Microbiology